VOA常速英语:US Senators Warn Latin America on Iran Ties

2. vigilance n. 警觉;警惕;警戒
例句：Guaranteeing the safety of students requires continued vigilance on the part of teachers.
要确保学生安全，教师得时常保持警惕。

3. retain vt.保持; 保留；止住; 容纳
例句：This village still retains its old world character.
这个村庄仍然保持着古色古香的特色。

4. stern adj. 苛刻的, 严格的
例句：They are very stern in their discipline.
他们的训练极为严格。

5. proceed vi.前进; 行进；进行; 继续下去
例句：They will proceed to build another laboratory building.
他们将着手建造另一座实验大楼。

6. wreak vt. 诉诸(武力);施行(暴力);发(脾气)
例句：The earthquake wreaked havoc on the city.
地震对这个城市造成了大破坏。

7. survival n. 幸存, 生存
例句：The doctor told my wife I had a fifty-fifty chance of survival.
医生告诉我的妻子, 说我活下去的可能性只有50%。

8. cripple vt. 严重毁坏（或损害）
例句：The general strike of the railway workers crippled the country's economy.
铁路工人的全面罢工使国家的经济陷于瘫痪。

9. overshadow vt. 使(某人)相形见绌或黯然失色
例句：Mary was sometimes overshadowed by the more talkative members of the family.
有时家中更健谈的人使玛丽显得黯然失色。

10. plot n. (秘密)计划, 密谋
例句：The police exposed a criminal plot to assassinate the President.
警察破了一个行刺总统的阴谋。